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Volume of Sphere
4/3 pi r squared
Surface Area of Sphere
4 pi r squared
Volume of Cone
1/3 pi r squared h
Area of Cone
pi r s + pi r squared
Volume of Pyramid
1/3 l w h
Area of Trapezoid
1/2 h (b1 + b2)
Standard Deviation
sqrt ((sum (x - mean)^2)/n) = sqrt of the average of the deviations squared
Variance
(sum of deviations)^2 / (n-1)
Permutation not alike
n!/r!
Permutation choosing like objects
n!/r1!r2!....rk!
Combination no relevance of order
n!/r!(n-r!)
Distance Formula
sqrt((x1-x2)^2 + (y1-y2)^2)
Chi squared statistic
(observed-expected)^2/expected
Mark R
OH
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